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The sample and test builds used full debug info. -g1 keeps what sanitizer reports and backtraces need - function names, files and line numbers - and drops the variable and type information nobody reads in CI. Objects get about 30% smaller (rh265.o under ASan+UBSan: 5.1MB to 3.7MB), so the ccache caches hold more of each job's build and are quicker to restore and save.